Your brain must still be a little tired, because why on earth would you think we would use Fahrenheit’s 0 and 100 as a basis for anything in Celsius?
I could say the same thing backwards: 0 to 100 C is 32 to 212 F.
The only reason there aren’t weird decimals there, is because Fahrenheit was later adjusted to have whole numbers at those same (water based) temperatures.